- Treat mpim (multi-party IM / group DM) channels as DMs — no @mention
required, continuous session like 1:1 DMs
- Only add 👀/✅ reactions when bot is directly addressed (DM or
@mention). In listen-all channels (require_mention=false) reacting
to every message would be noisy.
Based on PR #4633 by gunpowder-client-vm, adapted to current main.